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What is the effect of levees on flooding?

flooding levees
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What is the effect of levees on flooding?

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Levees can be very effective at containing a river and preventing flooding in low lying areas which would otherwise be flooded. However, they can aggravate flooding at downstream locations by increasing the rate at which the flood wave passes downstream and reducing the natural reservoir effect that occurs when a river overflows its banks and routes some of its flow to overbank storage areas.

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